Review on the effects of high-temperature coatings on durability of superalloys
[Introduction]High-temperature coating technology is a necessary method for the long-term service of various high-temperature component alloys.However,there is no unified conclusion on the effect of high temperature coating preparation on the original mechanical properties of the matrix alloys,and the effects of coating consumption,degradation,and corrosion-resistant element diffusion on the service lives of the matrix alloys.[Method]In this paper,the effects of the preparation of three generations of high-temperature coatings,namely diffusion coating,deposition coating,and thermal barrier coating,on the microstructure and properties of the matrix alloy were reviewed.The strengthening mechanism and deterioration mechanism of the aluminide coating on the stress rupture properties of matrix alloy were discussed.On this basis,the endurance strength of aluminide coatings under high temperature and long-term service environment of power station boilers was summarized.[Result]The main mechanisms affecting the high-temperature coatings are the formation of strengthening layer on coating surface,the interdiffusion of elements,and the change of the effective bearing cross-sectional area.[Conclusion]At present,there are still some shortcomings in the research of high-temperature coating technology.The solution of degradation during service,the in-depth discussion of related mechanisms,the preparation of high-temperature coatings on large-sized components,and the improvement of preparation processes are the future research directions.
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